c-ares version 1.19.1

This is a security and bugfix release.

A special thanks goes out to the Open Source Technology Improvement Fund
(https://ostif.org) for sponsoring a security audit of c-ares performed by X41
(https://x41-dsec.de).

Security:
 o CVE-2023-32067. High. 0-byte UDP payload causes Denial of Service [12]
 o CVE-2023-31147. Moderate. Insufficient randomness in generation of DNS
   query IDs [13]
 o CVE-2023-31130. Moderate. Buffer Underwrite in ares_inet_net_pton() [14]
 o CVE-2023-31124. Low. AutoTools does not set CARES_RANDOM_FILE during cross
   compilation [15]

Bug fixes:
 o Fix uninitialized memory warning in test [1]
 o Turn off IPV6_V6ONLY on Windows to allow IPv4-mapped IPv6 addresses [2]
 o ares_getaddrinfo() should allow a port of 0 [3]
 o Fix memory leak in ares_send() on error [4]
 o Fix comment style in ares_data.h [5]
 o Remove unneeded ifdef for Windows [6]
 o Fix typo in ares_init_options.3 [7]
 o Re-add support for Watcom compiler [8]
 o Sync ax_pthread.m4 with upstream [9]
 o Windows: Invalid stack variable used out of scope for HOSTS path [10]
 o Sync ax_cxx_compile_stdcxx_11.m4 with upstream to fix uclibc support [11]

Thanks go to these friendly people for their efforts and contributions:
  Brad House (@bradh352)
  @Chilledheart
  Daniel Stenberg (@bagder)
  Douglas R. Reno (@renodr)
  Gregor Jasny (@gjasny)
  Jay Freeman (@saurik)
  @lifenjoiner
  Nikolaos Chatzikonstantinou (@createyourpersonalaccount)
  Yijie Ma (@yijiem)
(9 contributors)

References to bug reports and discussions on issues:
 [1] = https://github.com/c-ares/c-ares/pull/515
 [2] = https://github.com/c-ares/c-ares/pull/520
 [3] = https://github.com/c-ares/c-ares/issues/517
 [4] = https://github.com/c-ares/c-ares/pull/511
 [5] = https://github.com/c-ares/c-ares/pull/513
 [6] = https://github.com/c-ares/c-ares/pull/512
 [7] = https://github.com/c-ares/c-ares/pull/510
 [8] = https://github.com/c-ares/c-ares/pull/509
 [9] = https://github.com/c-ares/c-ares/pull/507
 [10] = https://github.com/c-ares/c-ares/pull/502
 [11] = https://github.com/c-ares/c-ares/pull/505
 [12] = https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vc
 [13] = https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2
 [14] = https://github.com/c-ares/c-ares/security/advisories/GHSA-x6mf-cxr9-8q6v
 [15] = https://github.com/c-ares/c-ares/security/advisories/GHSA-54xr-f67r-4pc4
